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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4d896c092e5968acd0265eafc5502c0f0ae1834f98498006486e12bf7567a8b9' 
  AND token = 'DF8T86rpcJgM2varorDtit9ql7jZAYiQB19Vu1ur/vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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