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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2d561266f6af13f363ac2c9a4d990e839b0c8c1d1662ae1afd890a7b533815' 
  AND token = 'cWbB6GoaGs8vcww0MGtrsALbji+BvStMWPVPazDVKO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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