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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e66799fb38585c6d64c4cedbf7d95161e8079447afa01b525464c032e4cae97' 
  AND token = 'xVUVRDDx12PG/ZidsJCSE3WXsej8rTInCCxEoZbvZQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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