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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd658c60dd4807646e69e5f6e8398ea9d12a1114a1619f7c71184749ee29d365' 
  AND token = '8TSF0OmrBvgCqrGVpW7CF6Lpp08U4Kf/3rTY2Rz1Tw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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