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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5093f91f8f776b45672ed85a2b1124fd29bfff7da37d63a94cb80b9df86c4e9' 
  AND token = '7ZAnZ4IAn/N4Pt05Li/bRj4fJul4EuRkaSfIOe5OOjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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