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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd210b870c0e3fd53466ee3e496916f0869acac5ebb9362580a391c3fc3b27b12' 
  AND token = 'O7Q/NNf7NJhYTNslxn+0OYzxM8Q+l5q5v6g+Y2kf4oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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