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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4e65cc3938e47aabb5c3f2cd3112bd374451c216b14f55545af45cc3361ea2' 
  AND token = 'qsqZ4LHSq+1+ISvih274o4gyjjsXI7KHTx3bTQnlLpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}