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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbe805a7d990fab8f4f8e0fe52a8c899776a548eb521e91578610820c5db8e5' 
  AND token = 'wM6F5GAojdXKjRKoHZWnoC9a01ILvKNdf//CFU952ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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