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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429bc813dacdfe2538efd145e8733dc3bd70803f6334aa6c8a3405f7d069cf24' 
  AND token = '2q4X/7Ft9S6CKfCC87YHZNIwqheS73pPJ+I34ni+JRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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