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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5c64f5acd74334764a0c736d73d1196efa5cb56640a2e87b619438ad33241fe3' 
  AND token = 'E2s7pNR6DcGHQNwUdrebS3zGwEWQF+w7MT97l+6wmRs=' 
  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"
    }
  }
}