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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9ab686f77e42e8450a3423de2123b3eb2bc3cba012947aa6644cf4c69ac6ca1d' 
  AND token = '5Wq9oolQXze9bencIZMolj5eMZJHw4isQM2Mm20Pht4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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