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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11cac51a7a0ef38dc6e62df736a68690da466ae002ac5fab6be2b143fd3b299' 
  AND token = 'g1Ko69srbcFa+MJR9z8rxLPRPdjjpm/ZvtZxFqQ4jTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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