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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b25d312c3ad0c85ec9395998d6280ff3bf2237492b49e28239cb2fb27ff520d' 
  AND token = 'YqvNro+gcfcyChYaVi9G94P5EOeIr/7b2QPMbfVRtA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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