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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605699fbe4218b62c463c937f7b400ea2d6b7610cd6e1886e53489f1b2d04689' 
  AND token = 'J6Maa13U7mtURnpT/73n2c2Mpubvykx0knCPbSuaTnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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