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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3b267c587d99dad126d091ededcd53f37ded7e8fb4f5a5aececd6b77b6f098e8' 
  AND token = '96h6iQXEP/8Imw/6Rg3ecNSjAcD9dJmVWycSLF5XuQw=' 
  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"
    }
  }
}