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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cdcc6ff894af48cb6405b5592430e8a3866b476344f60789879c524b069a12e3' 
  AND token = 'lXlhRmAewQYfMGNRkwBBWJAf9EWbsdLFW56rmg3M81w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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