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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880ed294a62c6a6d9066b56f76a919bacb4a02eb1c8b6ed0f543d722592ab70c' 
  AND token = 'ZoE6vZRIc/0tskVLaZHgmGK/sf7ICnLQGOMYeCMCrfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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