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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '372b6a2bc92b7ec0be61670a01f3dd7e9d8d076da4e845b74046d79175a8eab4' 
  AND token = 'cMRIA4oxLDOEzWkT8S4ayIu4xNQ3ME+1lXNVvtUeLj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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