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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6596d4897b5d28b14ba29c02882194a30846bc9ba1e36e03075973fc326b4a24' 
  AND token = 'icp0jck1IpfdaSoXWJ1+2OAIkFDXBbsObu4GA4cX4Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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