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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb23c7d841c44f26cf991364ec8e0689fd330e6894748cebcea791b9da33f70' 
  AND token = 'Bi7m2kwyihdSHBizrmGlsPHM8dM9NntWHdBQHSecJrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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