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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9ca045d90e2104624bc3577ecb6fc50937a115a60b5b1f5ba2b1bea910383e' 
  AND token = '+ALliOSesnHp7TUp/f6Jcq6b43A6j70C076ggHyZS7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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