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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61d3fd965af1297e5a7c77cac7d73a941e207fc9597a97b69dc7e1520f4927c' 
  AND token = '0II0pq/EV97YsMzwgWDVFGAXVj4F+Rcq3xtdSdeHyj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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