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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '441340a3a82b6f3594964861383df1f9373de5d28fe45b4dd6b7adbd2ed40f8b' 
  AND token = 'a//g5MnK+xFxNkR0ERbkTrdUhJiTGYdddEa+jMD4Duo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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