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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829a57e7b716926f3d86e422b9c5bc92bdf587a9bbfdd338ad79bd33fee4f93c' 
  AND token = 'BVS+5Bin3j29MadC90qOwzT9SXdI+e9AKQHbfMqAoX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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