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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca51ac55b892b427757168c1ec4ba2c18915b0a040a43476d29f15a85ad9f3a' 
  AND token = 's9IFT/4gS7V7xFpWr4mZKV5iJ8FWBZxOaT00AwgAzoI=' 
  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"
    }
  }
}