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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd6a4b3d11a90c62ae6dc0248662d9a5a286f40cf27e11d2c0fca2f34d41036' 
  AND token = 'eV9dsE4oV26zMZ/seX7ruvcqHtHaUc0tTrid0PZwdrw=' 
  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"
    }
  }
}