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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9a12954505b96170ccbf2ec0dd9dfc8c04df30a61cd7a357be70977c54202e50' 
  AND token = 'mRv7Z2dRonefnZHhEdKpvg1bAl4YPCeaP/Mnk1gAk3s=' 
  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"
    }
  }
}