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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032572ea74b9a1194a6229aa81f9df9c832d48321b73c8b7980e7bca954aecde' 
  AND token = 'A8nF6c0BjrlJRRvOvE+dFeHjwx1otCtv4EQIHk8hADQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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