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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc6a55d41cb53966af9abe38a1502fa9a476b0deb962c567f7127f81055510e' 
  AND token = 'x81synrsQ6aqcWmLrOrhu8sr7uyDHm5a8EhE05dPwUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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