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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da3e61db5ca021eb989a84655b68cfe5b218b03a2f8fbf95892ae8d85eb98f4' 
  AND token = 'NvqvqJE2A1aO0gSt9xOuDIgcG9dH2rD6ZAvRknC8mIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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