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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1cb4f3443520c005e3dfa8a1bb760b9846835047b32e172492a74863fe7b84' 
  AND token = 'ngOgL1/f2w0rY1plNarcuDUOSfiwlxc+DiAfVdQr7eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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