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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a4e98dcdd840ed22bebe0fafc59209dafa5b55a03759bd90dbe256eb5a319288' 
  AND token = 'b4za1IN9rZCg437IT6E9FHJaGO9Pxpqn1p8YGlaoHec=' 
  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"
    }
  }
}