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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6e9850b12e806e87f10d78a715707f29d32bb3e485af88c3bad017e7d555b2' 
  AND token = 'EpVL4i9hxI+DjNKt068n6X1KnyJ9GHbdQmed+fpRUEg=' 
  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"
    }
  }
}