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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020be49e6b66ec9f5c51e9f4225a3cf2e11306303cf0d57b69ff1f4eff2f0134' 
  AND token = 'KV4qR8L6lstuerAX7XUeHijeNi0ytzNxfnufkUM+AIs=' 
  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"
    }
  }
}