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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c01d6f1fe4619f4b52d3e25ec9550a9979187eef55b5f2ac2c3ba7e9ab6fa97' 
  AND token = 'xZffptc7lro/3OHELB3Ud2LH1Dd8050tTIUdW31MReU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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