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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050ea0db56dc2766c4f287915c0354d90366e79e5e7d3ad6e85727d2008c04b7' 
  AND token = 'UtNGpl94z40OhA9bFWWeTFCOebl8+JIcJN972/J2juE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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