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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d9915b01465146176b1830c33ce15da30a4b8de37c203aba248419e84d04e1' 
  AND token = 'kwcZ5FYbN8kMmg47Zt+34/RW/u2Lie2TqzD1De1BcP8=' 
  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"
    }
  }
}