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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec0aa7f086d4bdf449478079dda5a47b35efc401e2d7127ede65e46961e8668' 
  AND token = 'vFxVzLBxL0ues8ur8hkqAYsmItVXemb0T+zgPzqdFr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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