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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3776231c201469f5e819fe3ece64d0bbae0e16e1b291ba558d4a56dcdda61606' 
  AND token = 'ndl32o1j+egZ+N8gSXn9HlNlF22ZcJZNT5UnDjJRuwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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