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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adabe708c6c39b68be43eb18b17ea8d557bb2e9917b60f5bf6e9be563c144bb' 
  AND token = 'mJ4nMXgKhUqvvQKGGKRObDkLw3wHfVgmt3dS6hAqKfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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