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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e7b409bfa77aa8e9c64fcaec8b6fa8dab19f982bb06eeea7e41f43586eb151' 
  AND token = 'Z4RTg0V+yiD9AWXchqC4oL7IJod0S7F8Lnf6sbkaj+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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