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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0fed0964907712283863af23a9324f208a87ccfa676c63d0b3f148bcb5ddcb59' 
  AND token = '8DLTWq02U3v+crvc+bI0x3EJ/MBciWRFAj1noY67WsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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