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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2b88f7cdd8dfcc898213f483d5233cc3ef0a4cc2bb0686dd195b6ddabf7bbc' 
  AND token = 'v0dVenNfmOjTEi7VdS3kGzUp2OM8q4xFbFZOcMkhFjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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