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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7523176436e50d1f0d3a1d152ba69f6451bad3e494b53a9fddb95c4f4263ffc7' 
  AND token = '4hU6+SoDc6YPxBAdfMUm4S9B4+xwGTBaCWiJXQvsiK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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