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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccd3da0ab548a10dcc08ab5f56c06a1de7e07c0e53e7ae17927a847db3f1d63' 
  AND token = '3zbmLLvzQO7Ivre0/8ZKN2xqo6swl8Vy7VefBzT1780=' 
  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"
    }
  }
}