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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '932c678a1d8fa85d432ee3f0955d0dcca9885732b6fd87e25271e4102fdde80e' 
  AND token = '3NsTiTZpVpKeu+E7o57aCHWRtNHI1w9QNgq+WRnkTA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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