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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a7c6571b166da95a6c576edb451a11952414b20af88074ebdb849d60be20cf' 
  AND token = 'qEcr5GR70sOkG4juCvL3g3Am4EBH6FZLg1Gr1d8OhpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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