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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be56fea5750c55199df7f046c70148b37ae6909e6a6b6f5c07a4c2ed111341af' 
  AND token = 'RYtuNOgJMGqXw95n1LinpY6cOyySUpX6PGhrSU9FImY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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