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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '90a940a7b485a8399eaf1d675d4db2c3c8626c95ae61a2a824270b39070f8a0d' 
  AND token = 'F8Sgk/so0dufTwZVp7VPhKr7rPO3U474v28I/SXDmo8=' 
  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"
    }
  }
}