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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6469d374e7902764a5a0170544248176e9714d6fbbb64e7d75ef61630ba888a' 
  AND token = 'cb9UGhHF0Qhgf3G6YWDI4s3AZNzlbZ/LDHxDNw88FAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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