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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '69678d98d7e8c572a28ca49b411d275c6c812b188fcb68558a7c114c7a234963' 
  AND token = 'zBDTHDMsfHAIonh9eBqB1jG7B1QNr/anzy8dW+oCgSM=' 
  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"
    }
  }
}