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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffd6e0ee02e4d9fc57a9fe7edcaa6a203fc18a115ad1614e749b79e7980dd78' 
  AND token = 'FX4u6aD8hH1F6e1OiZXguheo6uvk6Nu13b2MUOB+F5M=' 
  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"
    }
  }
}