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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f2ee6a579cbd0c3515e4c06aeb20b788918b7033bed7f6fdea9c5b0093d037bb' 
  AND token = 'V5kDLi+md3XIoOKm/MyLRCnNkPyDjoYBH+nrJvsQoZc=' 
  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"
    }
  }
}