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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1d48884bdb4ee1533d3ad3ecf8bfd671dfd2dc62e39be926b28c5d2c370ce6' 
  AND token = 'vx0wp04JN6uoWAeqSOBysPtKa16zY9mw9kdi0L+aHnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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