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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8915d95c33d0fbcdf4b0255e0dfaa2d9761c04759aa68255226345643b56f5e3' 
  AND token = '2WtYN6Lznp2+gNeprliFh5Y4ydPCxGMkyPOBv1o3fjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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