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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40a9f42b5feac4a8df06f62d980dc5d6f353366beecb401a9f07fd96c74ef47' 
  AND token = 'Z7NGXkyWJbY6xY71YSLeM/NdL4xzFHLA08haSuqSS5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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