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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ade3d9045a3124adeefbcc1d3d168adb737670acea45216e252438f8a02d99b' 
  AND token = 'v4rM8w8i6+a1cHc6OHsCgD4/rghhH6tde/9fRVRVdG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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