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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1398f553cd99e9a77038b5d398410c6d998eb030cb395d5f92de174725c292d' 
  AND token = '0NXBSA2qn/k3LGCQXkNc6St+GpT1PNPtxZxBF9HZWHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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