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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2814df6e1e096a23ebb9e4c8ce3c88ba332d0423b72eb48252a9268c37df2bf8' 
  AND token = 'aIA4A2w1zNBjcw+CYmUaRcxS+tx+IcE/TV1P6CRzz6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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