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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44148787ab81dede4efce77ee693e99658631daada51b684f1222fc96589ffa' 
  AND token = 'h4v2lirDo4SvKQ46h9KRvh1Vh8bsDlPXAzYC5VacbMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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