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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e3c2d99927ffc9e522dc7547e8eb8bd2c996b7b53765c28c43d73c40115de150' 
  AND token = 'i8wVpLaSTXno051Xaw7LqNUtl3UTKalN6poUV2IQRCE=' 
  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"
    }
  }
}