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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b1ecd6384ee14b2dae05b88dd849c5208419d881e364026214815d58477bc0' 
  AND token = 'Vn0ZUpQ1SvlDPNYzCyR94lLsp0P+r8WtA9+usuz0uhY=' 
  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"
    }
  }
}