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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71da8f169d1f106ae8c36a0fa834fa250e36f12edb384847ef7473e03cbfdad' 
  AND token = 'QZt+dNy+VQW9sRJ2ybha+JQlT2NVaOx/YBQhFAnrqxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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