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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a93d107bde5fac92c1326afb2931883f6f3ea70692fdd1a198ecdc11cfbd25a' 
  AND token = 'NnFN5cj8zqIDy5OpKb9hDZt/P+mbe7CJ5zV/OIioFtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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