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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56764d1a7ce7efaa0b50837763f1348c171763dc93fd171d6f472ad5d7c43f9' 
  AND token = 'oQvrT46c/t3sIuC0V2jOMK7eAICygbmEjR1A+iypZ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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