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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786d30436050d8f3270020ce678654669b63b2b24f49721a83941a2b2c35c7ad' 
  AND token = 'h/3mRmF7n9MUiZAqGT4drLfBKjZD30DYLOkJFh8an1k=' 
  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"
    }
  }
}