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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b9d21f544ea8f99da39083964d4c0ba8655f055bfb35b96e7bd4af1321940b6f' 
  AND token = 'S8uJyZ+QtenpCUIPSxNgYDFuP62oU4MZJduAN11SzOA=' 
  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"
    }
  }
}