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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcb7d0d5583bd9155f2bcf24984cf62a8018d814b59d4e8ffbeb68b5e2905ca' 
  AND token = 'rj2xg73Ip4Up9ZEEb38DPdJyItH2dQVrAb9acggRHW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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