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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef0a77e358cdc9f254898a3bf014d75b50be36bb29690a2a7db5c7f32563f70' 
  AND token = '/WCqkg7H3oxpaSYBA74IU9dKWw19hQG0ACBWtX2digQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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