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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4d168331fe1398767d5fa46e78d3e7866ebf08fd50567080beb0cf5132afa28c' 
  AND token = 'WUSWu75fIP04FJu8iM83rbIcyvC8fSjLPmY2IEmQipQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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