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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784a013665bbf184e297cb9d0830886cdc6a3a546ac6c3b06f708b20c167ba5d' 
  AND token = 'GLmqtlkbuGk63uTW43uO+8yo6UvInt2AoK/eW9FUE+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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