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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabb0cb0b7eb8af6a25d9114881b443e55b63a78efc64d34eed0482a5b1eb43b' 
  AND token = 'XfTeeh/WtRNQayMZpXLC5xNd5eobYx4983QDNqHVuoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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