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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcff300a3d089245fd2df2161abb4ec0caa0d9402117f68872990f19c5a53ad' 
  AND token = '8y3E6boz0rSLwE2s969EH07PcKGqWAgzbF/PYbHVgg8=' 
  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"
    }
  }
}