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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c66bea31b40353ee06a628cf29c65f1c8d088823d323998084b052fe0494bc9' 
  AND token = 'elsfu70lldjWR7gIGDW3TuE7yHo5t1kOmTh1Y1OWdk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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