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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b6cc2c29493b2148d8c4cc479fb35fd5eab66fc0f98cd381464599b4356570' 
  AND token = 'pibBu6LI8PdlzuajZQum9xCDt4mxS4q548qdhGP+s8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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