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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c660c87964133cf4be74823ba2d9c979a54ba17a38236437df4e29ded8b84cc0' 
  AND token = 'V7ZBLe4+rATeaeM5RicCUPH7/EgMKSv5g5Z+OnKXeRA=' 
  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"
    }
  }
}