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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dcb23c2e05bebd5a0deba52f07e692732b51dc24233c3b96b8c71b4df8d461' 
  AND token = 'Gq0Qr7X35zPPQyiUcIUgFHxPO+POKupsWZqaAL9Jvko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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