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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3c800afe2e4ee99320b5c5d59ed40355efbc50e4fa0e700b27450eebb7cc23ac' 
  AND token = 'OCRMZ2zqtKljpWuzup6Fsna4m7C0ETrNI6s+EiynxAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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