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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0c0c064589e4f73f95d0174a302595fd4e0a5e76843039becbc1fd31844e6f' 
  AND token = 'n6IZtPulKeXk+3PhNxpO6Ivv6V8D+rrAlmV/d8nde7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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