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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7fb56a957aa5ab4ae9d0b8f4ee0dbec3fbbac76a5c9b060953db1897ec9817' 
  AND token = 'r9+Dlzv//W7nNONaAX0WfzZQtHnexEOhMBjLgu5x2eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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